Ryan Seacrest is bringing out the big names for the second annual iHeart Radio Festival, set for Sept. 21-22 at the MGM Grand in Las Vegas. The 2012 lineup boasts a superstar roster featuring Pink, Rihanna and Taylor Swift — and that’s just the beginning.

The ‘American Idol‘ host unveiled the lineup this morning in a video announcement. “Last year, we introduced the world to the biggest live music event in radio history,” Seacrest said. “This year, the iHeart Radio Music Festival is back. It’ll be even more epic.”

Fans can purchase seats for the 2012 iHeart Radio Music Festival starting this Saturday at 1PM EST on Ticketmaster. In addition, participating radio stations across the country will be giving away all-expense paid trips to Las Vegas to some lucky listeners.